Synthesis of SAPO-56 Molecular Sieve and Its Catalytic Performance in Methanol-to-Olefins Reaction
1. SINOPEC Catalyst Company Limited Nanjing Division, Nanjing 210000, China;
2. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract：The synthesis of SAPO-56 molecular sieves with different Si contents was carried out by the method of low-high temperature multistep crystallization using N,N,N′,N′-tetramethyl-1,6-hexanediamine (TMHD) as template. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption, NH3 temperature programmed desorption (NH3-TPD) and evaluated their catalytic performances in the conversion of methanol-to-olefins reaction (MTO). The results indicated that the morphology of the samples changed greatly, especially the sample with the ratio of SiO2/Al2O3 0.4 appeared new sandwich layered structure. And the surface acidity increased with the increase of the ratio of SiO2/Al2O3. Moreover, the selectivity of olefins increased primarily and then decreased. The highest olefins selectivity was appeared when the ratio of SiO2 to Al2O3 was 0.4.
DU Yicun,ZHAO Yu,LIU Hongxing. Synthesis of SAPO-56 Molecular Sieve and Its Catalytic Performance in Methanol-to-Olefins Reaction[J]. 化学反应工程与工艺, 2020, 36(5): 436-441.
